Someone who gets targetted by prosecutors and charged because he won't a) snitch, b) turn informant, or c) make up information. Despite this pressure, they will maintain their integrity unlike spineless prosecutors.

Prosecutor: You think he will turn informant or just make up information?
FBI agent: What are you f'n stupidcronk? He's a DeMuth.
Prosecutor: You're right. We don't have a case. Let's charge him anyway.
FBI agent: Sounds good. We can always make shit up.

1: somebody who maintains their personal integrity under pressure from legal authority
2: somebody who doesn't snitch
3: Alternatively, somebody targeted by the police or legal authorities because they believe he has information that he doesn't really have, and instead of making up information to tell to the cops and get off, takes the consequences like a man